With spellcasters, the highest level of spell they can cast corresponds to the last digit of their base ability score (need at least a 10 for 0-level spells).
For clerics, this is Wisdom. With 11 Wis, you can cast 0 and 1st level spells. Level up and push it to 12 Wis, and you'll get access to 2nd level spells.
So, basically, having a low primary ability score (aka "casting stat") for a caster means that not only are their spells easier to resist (save DC is 10 + spell level + casting ability modifier), but they get fewer spells to cast (limit on spell levels castable, fewer or no bonus spell slots).
Wis: Cleric, Paladin, Ranger
Int: Wizard
Cha: Sorcerer, Bard
For more spells, I would try to invest in purchasing wands and scrolls that cast the higher level cleric spells you need, as you'll still be able to use them without restriction.
Modifié par The Amethyst Dragon, 17 mars 2013 - 09:45 .